public class Example4_9{
  public static void main(String[] args) {
    SIM simOne=new SIM(13889776509L);
    MobileTelephone mobile=new MobileTelephone();
    mobile.setSIM(simOne);
    System.out.println("手机号码："+mobile.lookNumber());
    SIM simTwo=new SIM(15967563567L);
    mobile.setSIM(simTwo);
    System.out.println("手机号码："+mobile.lookNumber());
  }
}
